Pre-grouting and water plugging method for permeable layer in vertical shaft

Abstract

A pre-grouting and water plugging method for a permeable layer in a vertical shaft includes the steps of reserving complete waterproof rock strata, performing spraying water treatment for a shaft body, building a water filtering layer, mounting a drainage sump and a waterproof layer, mounting and fixing a grouting guide pipe, pouring concrete grouting pad, performing water filtering layer grouting and performing grouting hole formation and laying the grouting guide pipe for grouting. The pre-grouting and water plugging method has the advantages that high grouting pressure meeting design requirements can be borne, grouting and water plugging effects under high water pressure and high grouting pressure during construction of the vertical shaft are guaranteed, the thickness of the grouting pad can be decreased to the greatest extent, and grouting pad construction and detachment workload is reduced, so that grouting effect is guaranteed, shaft body advancement speed is increased, and more obvious effect is achieved particularly as for a large-thickness permeable layer. Therefore, the pre-grouting and water plugging method can be effectively applied to pre-grouting and water plugging of the permeable layer in the vertical shaft and has good effect on experimental verification.

Description

technical field [0001] The invention relates to a process method for pre-grouting a water-permeable layer in a vertical shaft, in particular to a process method for pre-grouting a deep-thick permeable layer in a vertical shaft to block water gushing, and belongs to the technical field of mine construction engineering. Background technique [0002] During the shaft excavation, the aquitard is often crossed. The water blocking problem of the aquitard is the key to the safe excavation of the shaft. However, under the conditions of high ground pressure and high water pressure, it is very difficult to inject the grout into the cracks of the aquitard evenly and effectively. Generally, high grouting pressure is required, so it is necessary to ensure that the grouting pad has sufficient bearing capacity. In addition, the occurrence of permeable rock formations and joints and fissures control the distribution of grout. A poor grouting effect can easily cause water seepage accidents, ...

AI Technical Summary

Problems solved by technology

[0002] During the shaft excavation process, the aquitard is often crossed. The water blocking problem of the aquitard is the key to the safe excavation of the shaft. However, under the conditions of high ground pressure and high water pressure, it is very difficult to inject the grout into the cracks of the aquitard evenly and effectively.

Generally, high grouting pressure is required, so it is necessary to ensure that the grouting pad has sufficient bearing capacity. In addition, the occurrence of permeable rock formations and joints and fissures control the distribution of grout. The grouting effect is easy to cause water seepage accidents, which poses a huge threat to mine excavation

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